Rarity has her Rump Tested

By mdevaughnc
In My Little Pony Fanfiction
English
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Summary
Twilight is conducting a study on the physical resistance of unicorns. Rarity agrees to help her. She, and her rear end, would soon regret that decision.
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Contents 2 Chapters
Rarity has her Rump Tested
By mdevaughnc • 2 Chapters • Updated 31 Jan 2015
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